tests/helper-runtests.sh

shelve: add the missing `create` parameter to the bundlerepo constructor

Caught by pytype.

Differential Revision: https://phab.mercurial-scm.org/D7458

#
# Avoid interference from actual test env:

unset HGTEST_JOBS
unset HGTEST_TIMEOUT
unset HGTEST_PORT
unset HGTEST_SHELL